/*
 * Copyright 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.context.annotation;

import org.springframework.beans.factory.parsing.Problem;
import org.springframework.beans.factory.parsing.ProblemReporter;
import org.springframework.core.type.MethodMetadata;

/**
 * Represents a {@link Configuration} class method marked with the
 * {@link Bean} annotation.
 *
 * @author Chris Beams
 * @author Juergen Hoeller
 * @see ConfigurationClass
 * @see ConfigurationClassParser
 * @see ConfigurationClassBeanDefinitionReader
 * @since 3.0
 */
final class BeanMethod extends ConfigurationMethod {

    public BeanMethod(MethodMetadata metadata, ConfigurationClass configurationClass) {
        super(metadata, configurationClass);
    }

    @Override
    public void validate(ProblemReporter problemReporter) {
        if (getMetadata().isStatic()) {
            // static @Bean methods have no constraints to validate -> return immediately
            return;
        }

        if (this.configurationClass.getMetadata().isAnnotated(Configuration.class.getName())) {
            if (!getMetadata().isOverridable()) {
                // instance @Bean methods within @Configuration classes must be overridable to accommodate CGLIB
                problemReporter.error(new NonOverridableMethodError());
            }
        }
    }


    private class NonOverridableMethodError extends Problem {

        public NonOverridableMethodError() {
            super(String.format(
                    "@Bean method '%s' must not be private or final; change the method's modifiers to continue",
                    getMetadata().getMethodName()), getResourceLocation());
        }
    }
}
